Red Line 60103 Complete SI-1 Fuel System Cleaner Review

  • Written by: William Copper

The Red Line SI-1 Fuel System Cleaner is unique in that it applies both a cleansing and prevention of moisture build-up, carbon deposits and debris.

There are many fuel injector cleaners products available on the market today which use different types of ingredients or PEA purity and synthetic oil. But, thanks to Red Line SI-1’s verified PEA (polyether amines content) of between 30-50% you know that you’re getting the best quality cleaning.

Unlike competing fuel system cleaning products, the Red Line SI-1 confirms its’ PEA content via the MSDS (Material Safety Data Sheets). This is something that most fuel system manufacturers no longer do, making it difficult or impossible for consumers to judge the quality and content of ingredients. 

Red Line SI-1 Fuel System Cleaner has Two Approaches

The Red Line SI-1 Fuel System Cleaner is unique in that it applies both a cleansing and prevention of future moisture build-up, carbon deposits and debris. Using a synthetic blend of ingredients means that the possibility of any abrasive harm on your fuel system, pump, carburetors or engine are dramatically reduced. This is why so many people rely on Red Line SI-1 for fuel injector cleaning, as well as follow-up maintenance.

The Red Line SI-1 not only uses a unique synthetic upper cylinder lubricant but is also designed to handle both the highest and lowest engine temperatures on the market. As each consumer’s vehicle and condition will vary greatly it is understandable how the Red Line SI-1 is a high-demand product that has great application flexibility and positive performance results.

In comparison to competing fuel system cleaners, the Red Line SI-1 sets itself apart by providing a higher, more profitable treatment for intake valves and combustion chambers. If you’re looking to clean out your fuel system, injectors, and improve engine performance along the way then the Red Line SI-1 is the optimal product to choose.

Redline 60103 composition / ingredients

This table of ingredients is based on MSDS - Material Safety Data Sheets - it is possible that not every ingredient is here.

Ingredient name %

PolyEther Amine

30 - 50
Isooctanol - TLV- None established 1 - 10
Aliphatic Naphtha - TWA - 100 ppm 5 - 20


When to apply Red Line SI-1 Fuel Injector Cleaner

If you have any gasoline-powered vehicle (including ‘supercharged’) then you can use the Red Line SI-1 fuel injector cleaner to restore fuel efficiency, system cleaning, and overall engine performance.

Not all fuel system cleaners can guarantee the clearing and restoration of piston deposits. The Red Line SI-1’s capability to do so is again only possible thanks to it’s high-rated, natural, synthetic ingredients and PEA concentration levels.

If you have a “neglected” vehicle that’s been sitting for a long time the Red Line SI-1 Fuel Injector Cleaner is a great solution. Because of its synthetic ingredients, this means that it can work it’s way through and expel unwanted, harmful varnish, moisture build-up, and carbon deposits. Competing fuel system cleaner products cannot guarantee this, as they are designed with more “harsh” chemicals, are not of a synthetic blend, and do not have comparably high concentration ingredients (PEA rating).

Advantages and disadvantages

  • Red Line’s SI-1 Fuel System Cleaner is so powerful yet non-abrasive due to its synthetic ingredients that it can even restore fuel gauge functionality. When your fuel system such as the pump, lines, or pistons become dirty your vehicle loses its capability or even connection with its onboard computers. This often causes either inaccurate readings of current fuel or even disabling the feature altogether.
  • The Red Line SI-1 Fuel System cleaner has been tested and proven to reduce need for octane between 1 and 2 points. This means that fuel efficiency is likely to improve as the demand will be decreased thanks to cleansing agents found in this product. This also means a smoother functionality of your vehicle’s fuel system and can decrease the need for higher octane fuel, saving you money in the long-run. In this manner, you multiply your savings by investing in a product like the Red Line SI-1 Fuel System Cleaner.
  • The Red Line 60103 SI-1 Fuel System Cleaner is not designed for diesel vehicles. However, Red Line has developed an equally effective, successful product that is specifically designed for treating diesel vehicles in a similar manner which can be found here. This product also removes water and anti-freeze build-up within the engine and fuel system, prolonging its life and enhancing its overall performance.
  • Sometimes – especially in smaller vehicles such as motorcycles – fuel injector cleaners in general, but including the Red Line SI-1 cleaner will not be able to stop, restore functionality of, or restore a vehicle’s ability to no longer sputter, have hard start-ups, or power surges during gear shifts. If this is the case, it may be necessary to replace your current fuel injectors entirely. For those that only use their motorcycles during certain seasons, this is a prime example of why it’s necessary to run your vehicle outside, during the winter to prevent ethanol build-up which is harmful and can cause problems the next time go to start it up.

Frequently Asked Questions

How does the Red Line SI-1 differ from other fuel injector treatment products and fuel system cleaners?

Can I use the Red Line SI-1 Fuel System Cleaner on 2-stroke or diesel engines?

Outside of cleaning, can the Red Line SI-1 also prevent varnish and other forms of corrosion?

When can I use the Red Line SI-1 Fuel System Cleaner?

Consumer Ratings

The Red Line SI-1 Fuel System Cleaner has received very positive feedback and consistently satisfied customers. The only “drawback” per say, as is with any fuel system cleaning product, is the necessity to use this application multiple times on a regular basis.

To cut costs and make it more convenient you can purchase a 4 pack of Red Line’s 60103-4PK SI-1 Fuel System Cleaner of 15 oz bottles, or try out Red Line’s Oil SI-1 Fuel System Cleaner product by purchasing a pack of 6 15oz bottles.

You will find that Red Line’s fuel system cleaners all function in a comparably similar way, and each reinforced with the desirable natural, quality, synthetic ingredients and high PEA rating necessary to maximize results.

Buy or not to buy ? The Red Line SI-1 Fuel System Cleaner although proven to improve driving experience through the cleansing of carbon-deposit build-ups should remain appreciated and considered by those who are looking for a preventative fuel system cleaner.

The Red Line SI-1 has been tested and proven to clean and restore the condition of your fuel system, pump, lines, carburetors, fuel injectors, and pistons. However, this cannot always be guaranteed. How you treat your vehicle over time and perform necessary maintenance will heavily dictate the level of success you’ll have with fuel system cleaner products like the Red Line SI-1.

With that being said, it should be considered that Red Line is a top performing fuel system cleaner and is relied on by professional racecar drivers that run their engines at extremely high temperatures. Red Line has developed a fuel system cleaner that also improves heat transfer, prevents foaming, and stands up to the demands of professional racecars, which can be found here. The Red Line 80319 Liquid Assembly Lube is also designed to prevent corrosion, but unlike the other products mentioned above is meant for direct application onto your vehicles major moving parts.